Abstract
The recently discovered iron arsenide superconductors appear to display a universal set of characteristic features, including proximity to a magnetically ordered state and robustness of the superconductivity in the presence of disorder. Here we show that superconductivity in , which can be considered the parent compound of the superconducting arsenide family, is destroyed by very small changes in stoichiometry. Further, we show that nonsuperconducting is not magnetically ordered down to 5 K. These results suggest that robust superconductivity and immediate instability against an ordered magnetic state should not be considered as intrinsic characteristics of iron-based superconducting systems.
- Received 2 December 2008
DOI:https://doi.org/10.1103/PhysRevB.79.014522
©2009 American Physical Society
Synopsis
Superconductivity can be sensitive
Published 2 February 2009
Small changes in stoichiometry can destroy superconductivity in
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